Video teaser from group performances in episode 5 of "Youth with You" was released on show official youtube account.

You can watch all episodes of "Youth With You" (Idol Producer) here - with English subtitles!
And yes they are FREE!

Also, you can check fancams from "Yes! OK! theme song music video below. (click play and then pick watch on youtube button)

Fancams of: Esther Yu, Xiaotang Zhao, Babymonster An, Kiki Xu, Joey Chua, Snow Kong, Luna Qin, Xin Liu, and Hana Lin.